Difficult Macrocyclizations: New Strategies for Synthesizing Highly Strained Cyclic Tetrapeptides
作者:Wim D. F. Meutermans、Gregory T. Bourne、Simon W. Golding、Douglas A. Horton、Marc R. Campitelli、David Craik、Martin Scanlon、Mark L. Smythe
DOI:10.1021/ol034907o
日期:2003.7.1
[reaction: see text] Cyclic tetrapeptides are an intriguing class of natural products. To synthesize highly strained cyclic tetrapeptides we developed a macrocyclization strategy that involves the inclusion of 2-hydroxy-6-nitrobenzyl (HnB) group at the N-terminus and in the "middle" of the sequence. The N-terminal auxiliary performs a ring closure/ring contraction role, and the backbone auxiliary promotes